Tool



TOOL

Filed Jan. 25. 1926 FIGURE! 4:

mvlsn'rohs Patented Sept. 6, 1927.

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PATENT OFFICE.

THEODORE A. PIEHN AND GUSTAVE HEER, OF SAN JOSE, CALIFORNIA.

TOOL.

Application filed January 25, 1926.

This invention relates to a tool particularly adapted for use inresurfacing valve seats and counter-boring the same.

It is one object of the invention to provide a tool of the characterindicated which can be readily inserted through an opening of givendiameter and then extended to contact with the metal to be worked, andfinally locked in an extended position.

It is another object of the invention to provide a tool of the characterindicated wherein the cutting blades may be quickly and easily extendedand retracted as desired, and quickly and easily locked in any desi redposition.

It is still another object of the invention to provide a support andlocking means for the blade that will hold the same perfectly rigid whenin use.

It is also an object of the invention to provide a tool of the characterindicated that is simple in form and construction, consists of few partseasily assembled and disassembled, economical to manufacture, and highlyefficient in its practical application.

In the drawing Figure 1 is a side elevation of the tool.

Figure 2 is a section on line 2-2, F igure 1.

Figure 3 is a section on line 38, Figure 2, with the cutting bladepartly extended,

Figure 1 is a section on line 3-3, Figure 2, with the cutting bladeentirely extended.

Referring more particularly to the drawing, we show at 1 a cylindricalbar forming a the body portion of the device, threaded as at 2 near itsupper end and provided with an orifice 3 to receive a handle bar I.

Mounted upon the opposite, or lower end of the bar 1, and forming anintegral part thereof, is an enlarged portion 5 having the followingcharacteristics.

The portion or boss 5 is concentrically arranged on bar 1 and isprovided with an F upper surface 6 lying in a plane at right angles tothe longitudinal axis of the bar 1. At 7 is shoWn an annular channelformed in the upper surface 6 in concentric relation to bar 1, the bar 1itself forming the inner wall of the said channel. At 8 is shown a slotcut through the boss 5 and bar 1 in a plane lying at right angles to thelongitudinal axis of the bar 1, the inner side of the said slot lying inthe axial plane of bar 1, and the outer side of the slot being insubstantial alignment with a plane tangential Serial No. 83,622.

to the outer surface of the bar 1. A conical threaded socket is formedin the bottom of the boss 5 in axial alignment therewith, and thisSocket is fitted with a threaded and split nu At 10 we show a short barrectangular in transverse cross-section and adapted to engage and slideeasily in the slot 8. This bar is provided with a cut-ting edge at 11,and has a groove 12 formed transversely in its upper side.

At 13 is shown a cylindrical sleeve fitted snugly over bar 1 but freelyand easily revolved thereon. A nut is threaded on to the bar 1 as shownat 14, the threaded part 2 on bar 1 being so positioned as to permitscrew- 1 ing the nut 14 down tightly on sleeve 13.

In the lower end of sleeve 13 is formed a hole 15 lying parallel withthe bar 1. In this hole 15 is placed a pin 16 having an end 17 bentlaterally to engage the groove 12 in bar 10 is clearly shown in Figures2, 3 and 4.

The device having been assembled as described, the nut 14 is loosenedand the sleeve 13 rotated contra-clockwise. This movement causes the bar10 to slide in slot 8 until it is entirely contained in the said slot,through the engagement of the pin 16 therewith. The pin 16 is revolublmounted in the hole 15 so that when the s eeve 13 is rotated the a pinis carried around in channel 7 with its lower angular end 17 moving in ahorizontal plane. Since the end 17 engages the bar 10 the latter isforced to move with the pin 16.

A pilot rod 18 having one end inserted in the split nut 9 and with thenut tightened up in its socket in boss 5, is now positioned in the valvestem guide 19 in casing 20. The sleeve 13 now being rotated in aclockwise direction the bar 10 is extended until it engages the valveseat 21 through the medium of the pin 16 as above described. The barbeing properly positioned for cutting, the sleeve is forced down intopositive contact therewith by screwing up the nut 14: against its upperend.

In setting the cutter bar 10 it may be observed that it is merelynecessary to loosen the top nut 14 whereupon the bar may be accuratelyadjusted as desired, the movement of the sleeve 13 being accurate andunder perfect control. WVhen the bar is extended as far as may be thelower end of the pin 16 contacts with the inner side of the slot 8 andthereby prevents the bar from being so far extended as to lose itsnecessary leverage in the holder.

Since the pin 16 may be swung through an arc of nearly one hundred andeighty degrees a Wide range of adjustment for the cutter is secured. Thecutter may be securely locked in any desired position by merelytightening up nut 14 against sleeve 13, thereby rendering both sleeveand cutter immovable relative to bar 1.

The advantage of mounting the pilot 18 in boss 5 by means of a splitconical nut is that bars may be provided for all sizes of valve stemguides, the various sizes being adapted for use with the one size nut byturning down a short distance from one end as shown.

It is to be understood, of course, that While We have herein shown. anddescribedbut one specific embodiment of the invention, changes in form,construction, and method of application may be made Within the scope ofthe appended claims,

We claim 1. A tool of the character described, comprising a supportingbar and means for mounting a pilot rod therein, a cutter bar mountedtherein to move transversely thereof and having a slot formed in itsupper surface transversely thereof, a sleeve revolubly mounted on saidsupporting bar. apin revolubly mounted in said sleeve parallel With itsaxis of rotationand havin a: lateral extension adapted to engage theslot in said cutter bar, and a nut threaded on to said supportingbar toengage said sleeve;

2. A tool. of the character described, comprising a supporting barhavinga: boss formed on one end thereofinconcentric relation thereto, anannular channel tormed'in the upper surface of said boss in concentricrelation thereto, and having a slot formed therein transversely ofsai'd'boss With one side passing through substantially the center ofsaid bar, a cutter element slidabl'y moun ed in said slot, a pin carriedby said sleeve and passing through said channel and engaging said cutterelement, and means for forcing said sleeve into binding engage-- mentwith said cutter element.

3. A tool of the character described, comprising a supporting bar andmeans for supporting a pilot rod therein, said bar having a slot formedin one end thereof and transversely thereof andhaving one side lying inthe axial plane of said bar and the opposite side lying in a planesubstanta-lly tangential to the outer surface of said. bar, a cutterelement slida'bly mounted in 'said slot and having a slot formed in itsupper surface transversely thereof, a sleeve revolubly mounted on saidsupporting bar and engaging said cutterelement, an angular pin revolublymounted in, said sleeve and engaging the slot in said cutter element, ad means for forcing said sleeve into binding engagement with said cutterelement;

4. A tool of the character described, comprising, a supporting barhavinga: boss formed on one end thereof in concentric re lation thereto, thesaid boss having a threaded socket formedfin its under surface and meansfor mounting a pilot rod" in said socket, an annular channel formed inthe upper surface ofsaidboss in concentric relation thereto, and havinga slot formed therein transversely of said boss with one side passingthrough substantially the center of said barn a cutter elementslidablymount-- ed in said slot, a pin carried by said sleeve andpassing through said channel and engaging said cutter element and meansfor forcing said sleeve into binding engagement with said cutterelement.

THEODORE A. PIEHN. GUSTAVE HEER.

